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First published online December 16, 2008
Journal of Experimental Biology 212, 71-77 (2009)
Published by The Company of Biologists 2009
doi: 10.1242/jeb.020552

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Habitat temperature is an important determinant of cholesterol contents in copepods

R. Patrick Hassett^1,2,* and Elizabeth L. Crockett^1,2

¹ Department of Biological Sciences, Ohio University, Athens, OH 45701, USA
² Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, USA

View larger version (20K): [in this window] [in a new window]   Fig. 1. Effect of acclimation to warm and cold temperatures on cholesterol content of Calanus finmarchicus eggs and CV copepodites (A), Acartia hudsonica and Acartia tonsa (B), Temora longicornis and Eurytemora affinis (C). Acclimation temperatures are given above columns. Data are means ± s.e.m. *Significant difference at P<0.05 (two-way ANOVA). Sample sizes (number of replicate containers per incubator) for each species are: C. finmarchicus, N=6 (eggs), N=8 (copepodites), A. hudsonica, N=2; A tonsa, N=2; T. longicornis, N=6; E. affinis, N=10. One subsample was taken per replicate container except for Acartia spp., for which four subsamples were taken.

View larger version (5K): [in this window] [in a new window]   Fig. 2. Growth rates of the copepod Eurytemora affinis at 6°C and 25°C at different concentrations of dietary cholesterol. Two replicates were used per treatment, with each replicate calculated from the average length of 45–90 nauplii or copepodites. Data are presented as means ± s.e.m.

View larger version (7K): [in this window] [in a new window]   Fig. 3. Relationship between cholesterol content and habitat temperature in copepods. Cholesterol content (µg cholesterol mg–1 protein) plotted against both maximum habitat temperatures (filled circles) and temperature tolerance based on LD50 (open circles). Species identifications given adjacent to markers: (1) Euchaeta norvegica, (2) Calanus glacialis, (3a) Calanus finmarchicus cold acclimated, (3b) C. finmarchicus warm acclimated, (4a) Acartia hudsonica cold acclimated, (4b) A. hudsonica warm acclimated, (5a) Acartia tonsa cold acclimated, (5b) A. tonsa warm acclimated, (6a) Temora longicornis cold acclimated, (6b) T. longicornis warm acclimated, (7) Centropages hamatus, (8) Centropages typicus, (9) Eurytemora affinis. To conform to the conditions experienced by the other copepods, E. affinis was acclimated to seawater (32 p.p.t.) for 7 days. Data are presented as mean ± s.e.m. Sample sizes are N=10 for E. norvegica, C. typicus and E. affinis; N=8 for C. finmarchicus, N=6 for C. glacialis and T. longicornis, and N=2 for A. hudsonica, A. tonsa, and C. hamatus. Correlation analysis of temperature tolerance, r2=0.82, significance level P<0.001, maximum habitat temperature r2=0.84, significance level P<0.001.

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